Merge pull request rails#54860 from duffuniverse/fix-typo-in-rails-command-line-guide

[ci skip] Fix typo in The Rails Command Line guide

Author: byroot

guides/source/command_line.md

@@ -687,7 +687,7 @@ vendor/tools.rb:
 
 INFO: A good description of unit testing in Rails is given in [A Guide to Testing Rails Applications](testing.html)
 
-Rails comes with a test framework called minitest. Rails owes its stability to the use of tests. The commands available in the `test:` namespace helps in running the different tests you will hopefully write.
+Rails comes with a test framework called minitest. Rails owes its stability to the use of tests. The commands available in the `test:` namespace help in running the different tests you will hopefully write.
 
 ### `bin/rails tmp:`